Deck 20: Capacitors

Question 1

What is a device that opposes a change of voltage?

A) an inductor
B) a capacitor
C) a diode

Answer 1

B

Question 2

Polarized capacitors _____.

A) must be used with AC only
B) must be used with DC only
C) can be used with either AC or DC

Answer 2

B

Question 3

Two capacitors, a 20 μ F and a 30 μ F, are connected in series. What is the total capacitance?

A) 12 μ F
B) 50 μ F

Answer 3

A

Question 4

Two capacitors, a 20 μ F and a 30 μ F, are connected in parallel. What is the total capacitance?

A) 12 μ F
B) 50 μ F

Question 5

In a capacitor, the amount of dielectric stress is proportional to the _____.

A) distance between the plates
B) thickness of the dielectric
C) current flow through the capacitor
D) voltage difference between the plates

Question 6

A capacitor is constructed by separating two metal conductors known as _____ with an insulating material known as a(n) _____.

A) plates; dielectric
B) dielectrics; plate
C) electrolytes; ceramic
D) ceramics; electrolyte

Question 7

Increasing the surface area of the plates will cause the capacitance of a capacitor to _____.

A) decrease
B) increase
C) stay the same

Question 8

Three capacitors, a 12 μ F, a 20 μ F and a 30 μ F, are connected in parallel. What is the total capacitance?

A) 6 μ F
B) 62 μ F

Question 9

Energy in a capacitor is stored as a(n) _____.

A) electrostatic charge
B) magnetic field
C) electromagnetic field
D) circulating current

Question 10

A 100 μ F capacitor and a 3.6 k Ω resistor are connected in series. How long will it take for the capacitor to change its charge completely?

A) 1.8 s
B) 2.3 s
C) 3.8 s
D) 4.3 s

Question 11

Capacitors charge and discharge at a(n) _____ rate.

A) linear
B) exponential
C) geometric
D) sinusoidal

Question 12

In a capacitor, the voltage difference between the plates controls the _____.

A) area of the plates
B) thickness of the dielectric
C) amount of dielectric stress
D) amount of current flow through the capacitor

Question 13

What letter symbolizes the farad?

A) C
B) Q
C) F
D) V

Question 14

Nonpolarized capacitors _____.

A) must be used with AC only
B) must be used with DC only
C) can be used with either AC or DC

Question 15

What is the basic unit of capacitance?

A) henry
B) farad
C) ohm
D) coulomb

Question 16

In some capacitors, there is a small amount of current that flows from one plate, through the dielectric material to the other plate. This current is called _____ current.

A) leakage
B) conduction
C) electrostatic
D) electrolytic

Question 17

Three capacitors, a 12 μ F, a 20 μ F and a 30 μ F, are connected in series. What is the total capacitance?

A) 6 μ F
B) 62 μ F

Question 18

When a capacitor is connected in a circuit with a resistor, the amount of time needed to charge the capacitor is called the _____.

A) CR time constant
B) RC time constant
C) CR time variable
D) RC time variable

Question 19

A charge curve for a capacitor is divided into _____ time constants.

A) two
B) three
C) four
D) five

Question 20

The material between a capacitor 's plates is rated by a value called the _____.

A) dielectric constant
B) magnetic constant
C) dielectric variable
D) magnetic variable

Question 21

A HIPOT is a test set used to test capacitor _____.

A) capacitance
B) dielectric
C) leads
D) tolerance

Question 22

The JAN standard is used to mark a capacitor intended for _____.

A) industrial
B) civilian
C) military
D) laboratory

Question 23

Polarized capacitors are also known as _____ capacitors.

A) bipolar
B) variable
C) electrolytic
D) electroplated

Question 24

The _______________ indicates the amount of capacitance change with temperature.

Question 25

Variable capacitors normally have a dielectric of _____.

A) air
B) mica
C) Teflon
D) glass